干扰素α-2b局部治疗对增生性瘢痕Ⅰ、Ⅲ型胶原蛋白及前胶原蛋白基因原位表达作用的研究

目的 探讨干扰素α 2b在活体上对增生性瘢痕Ⅰ、Ⅲ型胶原的作用及作用环节。方法 对局部注射干扰素α 2b后 3天及 7天的 6例增生性瘢痕应用免疫组织化学和原位杂交技术 ,进行了Ⅰ、Ⅲ型胶原蛋白和Ⅰ、Ⅲ型前胶原mRNA的原位表达的测定。结果 ①干扰素α 2b在局部注射后 7天 ,Ⅰ型胶原蛋白量减少 (P <0 .0 5 ) ,但Ⅲ型胶原蛋白量无明显减少 (P >0 .0 5 ) ;②干扰素α 2b在局部注射后 3天 ,Ⅰ、Ⅲ型前胶原mRNA表达明显抑制 ,至注射后 7天 ,Ⅰ型前胶原mRNA被进一步抑制 ,而对Ⅲ型前胶原mRNA抑制缓解。③干扰素α 2b对Ⅰ型前胶原mRNA表达的抑制要比Ⅲ型前胶原mRNA强。结论 干扰素α 2b通过抑制前胶原基因的表达从而抑制Ⅰ。

康宁克通或干扰素局部注射对瘢痕PDGF BB基因表达影响

目的明确康宁克通和干扰素α-2b 对增生性瘢痕成纤维细胞的抑制是否通过 PDGF途径。方法对6例增生性瘢痕同一个体分区域同时局部注射康宁克通或干扰素α-2b 后3天及7天的 PDGF BB mRNA 原位表达进行了观察。结果①康宁克通或干扰素α-2b 在局部注射后7天增生性瘢痕的 PDGF BB mRNA 表达强度比未注射区均明显减少(P<0.01),但局部注射后3天表达强度与未注射区相比均无显著性差异(P>0.05)。②增生性瘢痕的 PDGF BB mRNA 原位表达强度高于正常皮肤。结论激素及干扰素α-2b 治疗瘢痕的机制之一是通过抑制 PDGF 基因表达,从而减少成纤维细胞的有丝分裂,使瘢痕的成纤细胞增殖受到抑制。

Selenoprotein P mRNA expression in human hepatic tissues

AIM: To investigate the expression of selenoprotein P mRNA (SePmRNA) in tissues of normal liver, liver cirrhosis and hepatocellular carcinoma (HCC), and its relationship with HCC occurrence and development. METHODS: The expression of SePmRNA in tissues of normal liver, liver cirrhosis and HCC were detected by in situ hybridization using a cDNA probe. RESULTS: The enzyme digesting products of PBluescript-H uman Selenoprotein P were evaluated by electrophoresis. The positive expression of SePmRNA was found in the tissues of normal liver, liver cirrhosis and HCC. The expression of SeP mRNA was found in hepatic interstitial substance, especially in endothelial cells and lymphocytes of vasculature. The positive rate of SePmRNA in normal liver tissue was 84.6% (11/13) and the positive signals appeared in the nucleus and cytoplasm, mostly in the nucleolus, and the staining granules were larger in the nucleolus and around the nucleus. The positive rate of SePmRNA in liver cirrhosis tissue was 45.0% (9/20) and the positive signals were mainly in the nucleolus and cytoplasm, being less around the nucleus and inner nucleus than that in normal liver tissue. The positive rate of SePmRNA in HCC tissue was 30.0% (9/30) and the positive signals were in the cytoplasm, but less in the nucleus. CONCLUSION: SePmRNA expression in the tissues of normal liver and HCC is significantly different (84.6% vs 30.0%, P = 0.003), suggesting that SeP might play a role in the occurrence and development of HCC.

Application of phage display technology in targeted therapy of breast cancer

Phage display is a technology of gene expression and screening, it is widely used in the fields of defining antigen epitopes, signal transduction, genetic treatment, parasites research and tumor targeted therapy. Breast cancer is the most common cancer in women, we can obtain peptides specially associated with breast cancer by using phage display technology, and this method has great potential in early diagnosis of breast cancer and development new targeted drugs.

Developmental expression amphioxus Branchiostoma pattern of calmodulin gene in belcheri tsingtauense

We investigated the developmental expression pattern of AmphiCaM in cephalochordate amphioxus （Branchiostoma belcheri tsingtauense）. We cultured and sampled the animals at different developmental stages （eggs and larvae）, and used in-situ hybridization and northern blotting to document the spatial and temporal changes in AmphiCaM expression. The alimentary tract dominates the development from the late neurula stage to the adult stage. AmphiCaM expression increased significantly in the alimentary tract during the late neurula stage and remained elevated in the adults. Our results indicate that AmphiCaM is involved in the differentiation of the alimentary tract in amphioxus; and furthermore, provide an insight into the change in function of CaM genes during evolution.

Elevated interleukin-13 in patients with active lupus nephritis

Objective To investigate the significance of interleukin-13 (IL-13) in patients with active lupus nephritis (LN).Methods Ten healthy volunteers and 16 patients with active LN were included in this study. The protein level of IL-13 in plasma was examined by enzyme linked immunosorbent assay (ELISA), and gene expression of IL-13 in peripheral blood mononuclear cells (PBMCs) by reverse transcription polymerase chain reaction (RT-PCR). Expression of IL-13 mRNA in renal tissue was studied by in situ hybridization (ISH) techniques.Results The level of IL-13 in plasma and the expression of IL-13 mRNA in PBMCs were significantly higher in LN patients than those in the controls ( P ＜ 0.001 ). Increased expression of IL-13 mRNA was detected in renal tissue of active LN patients compared to those in the controls ( P ＜ 0.001 ). Analysis of the linear correlation indicated that the level of IL-13 mRNA in the tubulointerstitial area in patients with active LN correlated with the concentration of serum creatinine (Scr), the glomerular activity index (GAl),the activity index of tubulointerstitium, and the level of serum C3 ( P ＜ 0.05 for each).Conclusion The elevation of IL-13 may play an important role inthe molecular pathogenesis of active LN.

In situ localization of procollagen gene expression on cryosections of undecalcified fracture callus

To analyze the expression of procollagen gene in fracture callus, and to search for the technique of in situ hybridization for undecalcified skeletal tissue. Methods: In situ hybridization of procollagen gene expression was performed on the undecalcified cryosections of rat fracture callus at 7, 14, and 28 d. Results: The hybridization signals achieved were clear and easy to be localized with high specificity. On the 7th day, the expressions of pro α1(Ⅲ) in fibroblasts and some chondrocyte like cells were dominant; and at the end of second week high expression of type Ⅱ procollagen mRNA was observed in chondrocytes. At the end of fourth week, the cartilaginous callus was almost all replaced by woven bone tissue, and some type Ⅰ procollagen mRNA positive osteoblasts and hypertrophic chondrocytes were found scattering in the woven bone and remnants of cartilaginous callus.Conclusions: The modified method employed in this study is easier, quicker, and more sensitive with high specificity than the conventional technique for in situ hybridization of procollagen gene expression of decalcified rat fracture callus. The phenomenon of shared phenotype expression, which was demonstrated among cells engaged in fracture healing, indicates an important approach to reveal the mechanism of the origin, differentiation, and orientation of cells.